The influence of polypropylene degradation on the membrane wettability during membrane distillation

Gryta, Marek; Grzechulska-Damszel, Joanna; Markowska, Agata; Karakulski, Krzysztof

doi:10.1016/j.memsci.2008.10.022

Cited by 108 publications

(82 citation statements)

References 19 publications

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“…Only a low intensity band was observed in the region of 1700-1750 cm´1, which can indicate that the carbonyl groups were created [25]. This is a weak band and was also observed for Accurel PP membranes soaked in hot distilled water [19]. The obtained results indicate that the applied PP membranes demonstrated a good chemical resistance during the MDC studies.…”

Section: Membrane Degradationmentioning

confidence: 67%

“…The membrane degradation usually proceeds very slowly and negative effects of this process are observed after e.g., 1-2 years of MD module exploitation [19][20][21][22]. Therefore, a single-stage MDC installation schematically presented in Figure 1 was used for accelerate the polypropylene degradation phenomenon during a short period of laboratory examination.…”

Section: Methodsmentioning

confidence: 99%

“…Polypropylene is a semicrystalline polymer and its mechanical properties depend to a large degree on a ratio of the crystalline phase to amorphous phase [19]. A consequence of polymer degradation is a change of the crystallinity degree of PP and a change in the chemical composition [19,21,24].…”

Section: Membrane Degradationmentioning

confidence: 99%

“…A consequence of polymer degradation is a change of the crystallinity degree of PP and a change in the chemical composition [19,21,24]. The FTIR and DSC analyses were performed in order to determine the intensity of these changes.…”

Section: Membrane Degradationmentioning

confidence: 99%

“…The membrane wettability in the MD process can also be as a result of chemical degradation of polymer, which causes the formation of hydrophilic groups on the membrane surfaces [19]. In the MD process, the membranes from polypropylene are frequently used [7,9].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of Polypropylene Membranes Applied in Membrane Distillation Crystallizer

Gryta

2016

Crystals

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Abstract:The studies on the resistance to degradation of capillary polypropylene membranes assembled in a membrane crystallizer were performed. The supersaturation state of salt was achieved by evaporation of water from the NaCl saturated solutions using membrane distillation process. A high feed temperature (363 K) was used in order to enhance the degradation effects and to shorten the test times. Salt crystallization was carried out by the application of batch or fluidized bed crystallizer. A significant membrane scaling was observed regardless of the method of realized crystallization. The SEM-EDS, DSC, and FTIR methods were used for investigations of polypropylene degradation. The salt crystallization onto the membrane surface accelerated polypropylene degradation. Due to a polymer degradation, the presence of carbonyl groups on the membranes' surface was identified. Besides the changes in the chemical structure a significant mechanical damage of the membranes, mainly caused by the internal scaling, was also found. As a result, the membranes were severely damaged after 150 h of process operation. A high level of salt rejection was maintained despite damage to the external membrane surface.

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Section: Membrane Degradationmentioning

confidence: 67%

Section: Methodsmentioning

confidence: 99%

Section: Membrane Degradationmentioning

confidence: 99%

Section: Membrane Degradationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Degradation of Polypropylene Membranes Applied in Membrane Distillation Crystallizer

Gryta

2016

Crystals

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Vacuum Membrane Distillation for Water Desalination

Upadhyaya¹,

Singh²,

Chaurasia³

et al. 2018

Membrane Processes

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Thermal properties of polypropylene nanocomposites: Effects of carbon nanomaterials and processing

Radhakrishnan¹,

Zagarola²,

Davis³

et al. 2010

Polymer Engineering & Sci

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Design of experiments was used to elucidate the complex interactions that determine nanocomposite properties and enable predictive models for optimization. The thermal properties of nanocomposites containingpolypropylene, single‐walled carbon nanotubes (SWNTs), dodecyl‐functionalized SWNTs, and vapor‐grown carbon fibers were investigated as a function of extrusion temperature, screw speed, and time. The effects of extruder processing conditions on thermal properties was dependent on the fraction of polymer chains stabilized in the interphase, the extent of polymer degradation, and the type of nanomaterial incorporated. Melting and crystallization temperatures were primarily affected by nanomaterial type. However, thermal decomposition temperature was affected significantly by processing conditions and the response wasdependent on the type of nanomaterial incorporated. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers

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The influence of polypropylene degradation on the membrane wettability during membrane distillation

Cited by 108 publications

References 19 publications

Degradation of Polypropylene Membranes Applied in Membrane Distillation Crystallizer

Degradation of Polypropylene Membranes Applied in Membrane Distillation Crystallizer

Vacuum Membrane Distillation for Water Desalination

Thermal properties of polypropylene nanocomposites: Effects of carbon nanomaterials and processing

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